Mercury 40 jet fourstroke User Manual page 99

IMPORTANT: The engine must be run during flushing in order to
open the thermostat and circulate water through the water
passages.
Rotating propellers can cause serious injury or death. Never
operate the boat out of the water with a propeller installed.
Before installing or removing a propeller, place the drive unit in
neutral and engage the lanyard stop switch to prevent the
engine from starting. Place a block of wood between the
propeller blade and the anti‑ventilation plate.
1. Place the outboard in either the operating position (vertical)
or in a tilted position.
2. Remove the propeller. Refer to Propeller Replacement.
3. Thread a water hose into the rear fitting. Partially open the
water tap (1/2 maximum). Do not open the water tap all the
way as this allows a high pressure flow of water.
IMPORTANT: Do not run engine above idle when flushing.
4. Shift the outboard into neutral. Start the engine and flush the
cooling system for at least five minutes. Keep the engine
speed at idle.
5. Stop the engine. Turn off the water and remove the hose.
Reinstall the propeller.
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MAINTENANCE
WARNING
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